QP STD R 002 REV 1

STANDARDS PUBLICATION

QP STANDARD FOR FABRICATION, INSPECTION AND INSTALLATION OF CARBON,

CARBON-MANGANESE AND LOW ALLOY FERRITIC STEEL PROCESS PIPE WORK

(Addendum to ASME B 31.3-2008)

Doc. No.: QP-STD-R-002 (Formerly ES-L-22 and ES-5.14.0010)

REVISION 1

CORPORATE QUALITY & MANAGEMENT SYSTEMS DEPARTMENT

QP STANDARD FOR FABRICATION, INSPECTION AND INSTALLATION OF CARBON, CARBON-MANGANESE AND LOW ALLOY FERRITIC STEEL PROCESS PIPE WORK (ADDENDUM TO ASME B 31.3-2008) Doc. NO. QP-STD-R-002 Rev. 1

Doc. File No.: STD.R.002.R1 Page 2 of 48 Custodian Dept.: QA

TABLE OF CONTENTS

FOREWORD

Pg. Nos.

1.0 OBJECTIVE

……………………. 5

2.0 SCOPE

……………………. 5

3.0 APPLICATION

4.0

4.1 4.2

TERMINOLOGY

Definitions Abbreviations

…………………….

…………………….

…………………….

5 5 5

5.0

5.1 5.2 5.3

REFERENCE STANDARDS AND CODES

Main Reference Code - Process Piping - ASME B31.3 National, Regional and International Standards QP Standards/Specifications

…………………….

……………………. ……………………. …………………….

7 7 7 8

6.0

6.1 6.2 6.3 6.4 6.5

RESPONSIBILITIES OF THE CONTRACTOR

Workmanship Personnel Materials Substitutions and Modifications Errors and Omissions

…………………….

……………………. …………………….

……………………. …………………….

…………………….

8 8 8 9 9 9

7.0

7.1 7.2 7.3

MATERIALS

Piping Materials Material Control at Site Transportation, Storage and Handling

…………………….

……………………. …………………….

…………………….

9 9 9 10

8.0

327 328 330 331 332 335

SUPPLEMENTARY TO CHAPTER V OF ASME B31.3 (FABRICATION, ASSEMBLY & ERECTION)

General Welding Preheating Heat treatment Bending and Forming Assembly and Erection

…………………….

……………………. …………………….

……………………. …………………….

……………………. …………………….

10 11 11 24 24 26 27

9.0

340 341 342 343 344

SUPPLEMENTARY TO CHAPTER VI OF ASME B31.3

(INSPECTION, EXAMINATION & TESTING)

Inspection Examination Examination Personnel Examination Procedures Types of Examination

…………………….

……………………. …………………….

……………………. …………………….

…………………….

28 28 28 29 29 29



345 Testing

……………………. 31

10.0 QUALITY REQUIREMENTS

……………………. 33

11.0

11.1 11.2

DOCUMENTATION

General Document Submission

……………………. ……………………. …………………….

34 34 34

12.0

12.1

APPENDIX

APPENDIX I - TABLES

12.1.1 Table 1- Welding procedure Qualification Test Requirements………………… 36

12.1.2 Table 2A- Welding Procedure Thickness/Diameter Qualification Ranges…… 36

12.1.3 Table 2B- Approval Diameter Range for Welders Qualification tests………… 36

12.1.4 Table 3- Recommended Filler Metals for P-Numbers 1 thru’ 5………………… 37

12.1.5 Table 4- Minimum Recommended Preheat Levels………………………………. 38

12.1.6 Table 5- Post Weld Heat Treatment………………………………………………… 39

12.1.7 Table 6- NDT Acceptance Criteria………………………………………………….. 40

12.1.8 Table 7- Extent of Non Destructive Testing………………………………………. 41

12.1.9 Table 8 – The number and location of thermocouples.................................. 42

12.2 APPENDIX II - FIGURES

12.2.1 Figure 1- Removal of Charpy V-Notch Specimens……………………………….. 43

12.2.2 Figure 2- Location of Hardness Indentations……………………………………... 44

12.2.3 Figure 3- Dimensional Tolerances…………………………………………………... 45

12.2.4 Figure 4- Post Weld Heat Treatment Requirements for Set-On and Set-In

Nozzles………………………………………………………………………..

46

12.2.5 Figure 5- Local heat Treatment for Branch Connections………………………..

47

REVISION HISTORY LOG ……………………. 48



FOREWORD

This document has been developed by Corporate Quality and Management Systems Department, reviewed by User Departments and endorsed by concerned QP Management for use as Corporate Standard. This document is the replacement of the old version of the following documents: ES-L-22 and ES.5.14.0010. This Standard will supersede the said standards and serve as technical guidance for preparing project specification on the specific subject. This document shall be used in conjunction with ASME B 31.3 2008, as Clauses 8.0 and 9.0 of this document are supplementary to chapter V and VI respectively of the said standard. This document is published for the utilisation of project teams, business units, QP Departments and Contractors / Consultants employed by them. It should be emphasised that the document is to be used for QP operations / wherever applicable and appropriate. The document in its present numbering, layout and format was prepared in accordance with the standardization procedures (QP-PRC-A-001 & QP-PRC-A-003). The document in its present form reflects as far as possible the current QP requirements taking into account the known available industry practices and the applicable latest national and international codes and standards. The document is subjected to periodical review to re-affirm its adequacy or to conform to any changes in the Corporate requirements or to include new developments on its subject. It is recognised that there will be cases where addenda, data sheets, or other clarifications need to be attached to the standard to suit a specific application or service environment. As such, the content of the document shall not be changed or re-edited by any user (QP or its contractors, suppliers, agents, etc.), but any addenda or clarifications entailing major changes shall be brought to the attention of the Custodian Department. The Custodian of this document is Corporate Quality and Management Systems Department. Therefore, all technical comments, views, recommendations, etc on this document should be forwarded to: The Manager, Corporate Quality and Management Systems Department Manager



1.0 OBJECTIVE

The objective of this standard is to state Qatar Petroleum's (QP) requirements for the fabrication, welding, inspection and installation of carbon, carbon-manganese and low alloy ferritic process and utility pipework.

2.0 SCOPE

2.1 This standard details QP‘s supplementary requirements to Chapters V and VI of ASME B31.3, Process Piping.

2.2 The scope shall include all process, utility piping and in-line instrumentation piping. The welding of riser pipe-work and transmission pipelines is outside the scope of this standard.

2.3 Erection shall consist of complete installation of piping systems as defined by the piping drawing documents. It includes the installation of all piping and piping components, welding, related examinations, inspection and testing in both shop and field environments.

3.0 APPLICATION

This standard shall be applied for projects on new and existing installations for all QP Production Facilities, both onshore and offshore.

4.0 TERMINOLOGY

4.1 DEFINITIONS

The following definitions apply throughout this standard:

QP Shall mean QATAR PETROLEUM or appointed MANAGING CONSULTANT.

CONTRACTOR The party which entered into contract with QP for the execution of activities, as mentioned in a written agreement.

CERTIFYING AUTHORITY

The party which entered into contract with QP for the certification of the project.

THIRD PARTY INSPECTORATE

The impartial body appointed by QP or Contractor possessing the necessary competence to verify that the designs, qualifications, procedure or fabrications satisfy the specified requirements.

May Used where alternatives are equally acceptable.

Shall Used where the provision is an absolute requirement to be followed strictly in order to conform to this standard.

Should Used where provision is recommended to conform to this standard.

4.2 ABBREVIATIONS

The following abbreviations are used throughout this standard:



ANSI American National Standards Institute

ASME American Society of Mechanical Engineers

ASNT American Society for Non-Destructive Testing

ASTM American Society for Testing and Materials

AWS American Welding Society

BS British Standard

CA Certifying Authority

FL Fusion Line

GSFCAW Gas Shielded Flux Cored Arc Welding

GTAW Gas Tungsten Arc Welding

HAZ Heat Affected Zone

HV Vickers Hardness

IQI Image Quality Indicator

ISO International Standards Organisation

MPI Magnetic Particle Inspection

NACE National Association of Corrosion Engineers

NDT Non-Destructive Testing

NPS Nominal Pipe Size

PCN Personnel Certification in Non Destructive Testing

PWHT Post Weld Heat Treatment

PQR Procedure Qualification Record

QA Quality Assurance

QC Quality Control

ROL Run Out Length

RT Radiographic Testing

SMAW Shielded Metal Arc Welding

SAW

MoE

Submerged Arc Welding

Ministry of Environment

UT Ultrasonic Testing

WM Weld Metal

WPS

TPI

Welding Procedure Specification

Third Party Inspectorate

YS Yield Strength



5.0 REFERENCE STANDARDS AND CODES

5.1 MAIN REFERENCE CODE - PROCESS PIPING - ASME B31.3

ASME B31.3 – 2008 shall be utilized in conjunction with the amendments and additions required by this Supplement plus any additional QP requirements specified in the Project Contract Documents. In case of conflict between this standard and other Project Specifications, the most stringent interpretation shall be adopted.

In clauses 8 and 9 of this standard, the titles and numbering of the main Clauses and sub-clauses are the same as those of ASME B31.3. Additional Clauses and sub-clauses to ASME B31.3 are indicated, but gaps in sub-clauses numbering of this standard indicates that the related sub-clauses of ASME B31.3 do not require amendment.

5.2 NATIONAL, REGIONAL AND INTERNATIONAL STANDARDS

ISO 9000 Series Quality Management and Assurance Standards

ISO 3690 Welding and Allied Processes - Determination of Hydrogen

Content in Ferritic Steel Arc Weld Metal

ASME B16.9 Factory Made Wrought Steel Butt Welding

ASME B16.25 Butt-Welding Ends

ASME B1.20.1 Pipe Threads, General Purpose (Inch)

ASME II Part A Ferrous Material Specifications

ASME II Part C Specifications for Welding Rods, Electrodes, and Filler Metals

ASME II Part D Properties (Customary) MATERIALS

ASME V Non-destructive Examination

ASME VIII Rules for Construction of Pressure Vessels. Division 1 & Division 2

ASME IX Welding and Brazing Qualifications

ASME B31.3 Process Piping

ASTM A370 Rev A

ASTM

Standard Test Methods and Definitions for Mechanical Testing of Steel Products

All ASTM relevant materials standards as modified by QP related specifications.

AWS D10.11M

/ANSI D10.11

Guide for Root Pass Welding of Pipe Without Backing Strip.

AWS A2.4 Standard Symbols for Welding, Brazing, and Non-destructive Examination

AWS A3.0 Standard Welding Terms and Definitions.

AWS A5.1/A5.1M Specification for Carbon Steel Electrodes for Shielded Metal Arc Welding

AWS A5.5 Specification for Low-Alloy Steel Electrodes for Shielded Metal Arc Welding



AWS A5.17/A5.17M Specification for Carbon Steel Electrodes and Fluxes for Submerged Arc Welding

AWS A5.18/A5.18M Specification for Carbon Steel Electrodes and Rods for Gas Shielded Arc Welding

NACE MR 0175-2001

API RP 2201 API 570

Petroleum and natural gas industries — Materials for use in H2S-containing environments in oil and gas production

Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries‖.

Piping Inspection Code

5.3 QP STANDARDS/SPECIFICATIONS. QP-STD-R-001 QP Technical Standard for Materials for Sour Service

QP-STD-R-003 Technical Standard for the Fabrication Inspection and Installation

of Austenitic and Duplex Stainless Steels, Copper and Nickel

Base Alloys Process Pipe-work(Addendum to ASME B 31.3-

2008)

QP-SPC-L-002 QP Technical Specification for Painting and Wrapping of Metal

Surfaces

QP-STD-Q-004 Corporate Standard for Quality Requirements for Projects

QP-STD-S-056 QP Radiation Safety Standard for Industrial Radiography

ES-S-60 Specification for Non Destructive Testing of Welds

ES.5.06.0008 Piping – General Design

ES.5.06.0019 Flange Bolting Guidelines

5.4 CONTRACTOR shall obtain the latest issues of all Specifications, codes and standards referred to in this document and shall make them readily available to all personnel involved with the work.

6.0 RESPONSIBILITIES OF THE CONTRACTOR

6.1 WORKMANSHIP

CONTRACTOR shall ensure that all materials, workmanship and inspection conform to the requirements of this specification, and shall supply all labour, tools, consumables, equipment and services necessary to accomplish his task as per contract requirements.

6.2 PERSONNEL

CONTRACTOR shall have fully experienced supervisory personnel in charge of all aspects of the work, and shall employ only fully qualified tradesmen to carry out the work. Personnel qualification requirements shall be as per ASME B31.3, ASME IX and

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additional requirements as specified in the contract documents and referred standards & specifications. Personnel curriculum vitae‘s shall be submitted to QP for prior approval.

6.3 MATERIALS

The checking, preparation, fabrication, inspection and non-destructive testing of all materials to be used shall be the responsibility of CONTRACTOR, and shall be in accordance with the requirements of this specification and contract requirements. All such work shall be to Contractor‘s account.

6.4 SUBSTITUTIONS AND MODIFICATIONS

CONTRACTOR shall make no substitution of materials and/or modification of details, without the prior approval of QP (and Third Party Inspectorate, where applicable). CONTRACTOR shall submit, in writing, all such changes to QP for prior approval.

6.5 ERRORS AND OMISSIONS

CONTRACTOR shall be responsible for all errors and omissions in the detailing, layout and fabrication. It is an obligation of the Contractor to check QP‘s documents and drawings and to notify QP of any errors or omissions.

7.0 MATERIALS

7.1 PIPING MATERIALS

7.1.1 Unless stated otherwise in the contract specifications, drawings and documents; all

piping materials required to execute the works shall be supplied by CONTRACTOR in

accordance with the relevant Specifications listed under clause 5.0 of this standard, and,

as specified in the contract.

7.1.2 Alternative materials may only be substituted with QP‘s prior written agreement.

7.1.3 Pipe lengths and pipe-fittings, unless otherwise specified, shall be supplied to the

manufacturing tolerances of the applicable standards.

7.2 MATERIALS CONTROL AT SITE

7.2.1 A quarantine store shall be established at the fabrication site to hold material awaiting

proof of compliance with specified requirements.

7.2.2 A secure store, for holding those materials, which after completion of site inspection are

proved to be satisfactory and to be complete with all necessary and identifiable

certification, shall be similarly established.

7.2.3 The CONTRACTOR shall establish both the quarantine and the secure stores and shall

submit details of design, layout and organisation to QP for approval. Special precautions

shall be taken to ensure that all material used for fabrication and installation of pipework

is fully documented and available prior to release to fabrication and installation.

7.2.4 CONTRACTOR shall adopt the colour coding system specified in QP-STD-R-001 to

identify different types of materials.



7.2.5 The CONTRACTOR shall establish procedures for the transfer of identification marks

(including heat number‘s) when pieces are cut from their parent pipe as required by the

quality plan. Pipe identification shall be completed prior to cutting.

7.3 TRANSPORTATION, STORAGE AND HANDLING

7.3.1 CONTRACTOR shall ensure that adequate protection against damage is provided for all components during any storage, loading and transportation activities, by providing adequate timber bearers during the transport and the wrapping of lifting points.

7.3.2 Pipes, completed spools or component parts shall be stored above the ground on pallets, timber blocking or other similar supports, so as to be kept above the level of any standing water and be kept free from dirt, grease, paint sprays and any other harmful treatments which in the opinion of QP could affect its ability to perform its intended function.

Note: CONTRACTOR shall protect all open ends pipes and flanges by the use of plastic end caps and timber blinding respectively.

7.3.3 CONTRACTOR shall provide adequate certified safe lifting slings or similar equipment during handling or lifting operations, which shall be according to Corporate Lifting Regulations (QP-REG-Q-001 R4). The use of chains for lifting is not acceptable. When pipes are lifted by their ends, soft faced hooks shall be used.

7.3.4 Damage to any part of the pipe-work or sub-assemblies, before, during or after installation shall immediately be brought to the notice of QP.

7.3.5 All completed spools shall be transported by a method, which does not induce significant deformations or stresses. Care shall be taken in the suitable placement of lifting lugs and/or temporary attachments.

7.3.6 Particular care shall be taken in the storage and handling of coated and painted parts, the damaged coating shall be restored to comply with the specified requirements by a method approved by QP.

7.3.7 Different grades of material shall be clearly marked using an identification coding system approved by QP in accordance with QP-STD-R-001. The steel types shall be stored in dedicated locations to avoid inadvertent mixing.

7.3.8 The cutting of pipes and/or plates, the transferring of marks and where pertinent, the particular identity of the piece shall be carried out in such a manner that a particular grade of material can at any time be identified within a spool, installation. etc., If any material is found without the appropriate reference CONTRACTOR shall prove the identity of the material to the satisfaction of QP.

8.0 SUPPLEMENTARY TO CHAPTER V OF ASME B31.3 (FABRICATION, ASSEMBLY AND ERECTION)

8.1 The following clauses are supplementary to Chapter V of ASME B31.3 - 2008 Edition. They cover the requirements and procedures for the welding of process pipe-work in the workshop, yard and offshore. For convenience the headings and numbering system used within this section follow those of ASME B31.3.



8.2 The clauses of this section do not relieve the contractor of his responsibilities, guarantee or of any other contract bond with respect to welding performance and welding results. During welding operations, inspection and testing CONTRACTOR shall observe and follow current regulations concerning personnel safety, prevention of fire, explosions and accidents. CONTRACTOR shall follow MoE regulations regarding radiation protection & handling of radioactive sources and X ray units.

8.3 No exception to this section is allowed without the written authorisation of QP.

327 GENERAL

327.1 PROCESSES

All welding including tack welding, shall be accomplished with low hydrogen processes, which shall deposit weld metal with a diffusible hydrogen content less than 5ml per 100gm of deposited weld metal. Tests to confirm the diffusible hydrogen level shall be conducted to BS ISO 3690, if requested by QP. These tests shall be at the CONTRACTOR'S expense.

Acceptable welding processes for the fabrication of pipe-work are SMAW, GTAW and SAW.

(Addition)

Other welding processes shall not be used without the approval of QP. If alternative processes are intended to be used, any such proposal shall, at the bid stage, state all items and areas of intended use, together with full details of the process, consumables and CONTRACTORS past history of use. QP may refuse, or limit the use of an intended process, and may specify additional testing and inspection requirements.

328 WELDING

328.2 WELDING QUALIFICATIONS

328.2.1 Qualification Requirements

(a) CONTRACTOR shall conduct the tests required to qualify the procedures and these shall be witnessed by QP (and the CA/TPI if specified in the contract documents).

The proposed WPS's shall be submitted for QP review and approval prior to carrying out procedure qualification. Existing pre-qualified procedures may be considered, subject to the submission of the supported PQR documentation to QP. If pre-qualified procedures are accepted, QP reserves the right to re-qualify a representative number of them.

Prior to qualifying the welding procedures, CONTRACTOR shall submit for approval a schedule of Welding and Repair Procedure, Specifications, and drawings, to define the scope and the intended areas of application. Qualification of repair procedures for sour service shall cover at least two repair scenarios; Partial repair and through thickness repair. Original welding procedure shall be used for re-welding the cut out weld joints.



Welding procedure specifications shall, as a minimum, record the information required below:

(i) The steel type, grade, P-Number, group number, pipe diameter, carbon equivalent and thickness used for qualification,

(ii) The welding process or processes when a combination is used,

(iii) The type, size, classification, F-number and A-number of the welding consumables, consumables, batch or lot number and brand name,

(iv) Shielding gas and flow rate, when applicable,

(v) For each run, the proposed arc current and voltage; width of weave, (electrode run out length and burn off time for SMAW), welding speed and calculated heat input,

(vi) The weld preparation including tolerances,

(vii) The cleaning method proposed,

(viii) Applicable welding positions and directions, welding technique weaving or string.

(ix) The minimum preheat and maximum interpass temperatures,

(x) The treatment to the second side, e.g., purge gas and purge rates,

(xi) A sketch showing, as a minimum, the deposition sequence of the first four layers. If the weld is double sided, show the second side root deposition sequence,

(xii) Any deposition augmentation system used,

(xiii) Consumable treatment where this forms part of the procedure, e.g. baking temperature and time,

(xiv) Tack welding procedure (tack size and separation),

(xv) Wire stick-out, if applicable,

(xvi) For SAW, the angle of inclination of the electrode to the work-piece and stand-off, flux classification.

(xvii) PWHT, where applicable, indicating the heating and cooling rates, socking time and temperature.

All welding procedure qualification testing shall be performed on material approved by QP. The use of other material may be accepted at the sole discretion of QP, provided it complies with the project material specification. The heat number and certification number shall be recorded.

Weld test pieces shall be of sufficient size to allow for all the tests and permitted retest specimens. Retesting shall only be permitted on test specimens removed from the original test weld.

Should the test weld fail any of the required tests and the permitted retests, the cause of the failure shall be analysed to the satisfaction of QP and rectified. The complete welding procedure tests shall then be repeated.



A qualified welding procedure is one, which, has been tested to, and has achieved the requirements of this specification and has been approved by QP.

Qualification of a welding procedure is restricted to the contractor who conducted the welding procedure test.

Production welding shall not commence until the appropriate procedure tests, PQRs and WPSs‘ have been approved by QP.

The use of plate qualifications to support a welding procedure for pipe-work is not permitted. (Amendment)

(d) Impact testing shall be conducted for all materials where it is required for the base material or where the minimum design temperature is below -10

oC.

Impact testing shall be performed on specimens as detailed in Figure 1, in appendix II of this standard, in accordance with ASTM A370. The number of specimens shall be as indicated in Table 1 in appendix I of this standard, however where the thickness of the weld exceeds 25mm an additional set of three specimens shall be taken, with the notch at the root of the weld. Specimens shall be etched in order to accurately locate the Charpy V-notch.

Impact tests shall be carried out at the minimum design temperature or at the parent metal test temperature; whichever is more stringent.

The acceptance criteria shall be as per Table 323.3.5 of ASME B31.3.

If the minimum average impact value is not attained, and only one specimen shows a value less than the minimum individual value, three additional specimens shall be selected from a position similar to that from which the set of specimens under consideration were taken. The value of each of these retest specimens shall equal or exceed the required average value and the average of all six specimens shall exceed the required average.

Sub-size specimens are only acceptable where full size specimens cannot be extracted from the test welds. The largest possible sub-size specimen shall be taken. The test temperature shall be as per subsection 323.3.4 of ASME B31.3 and The acceptance criteria shall be as per Table 323.3.5 of ASME B31.3.

(Amendment)

(e) The use of consumable inserts is not permitted. (Amendment)

(f) P-Numbers.

The extension of a welding procedure specification from the material on the PQR to a material of a different specification, even if it has the same P-Number, shall only be permitted with prior approval of QP. (Addition)

(g) Changes which require a new welding procedure specification qualification are as follows:



(i) A change in welding processes or processes combination.

(ii) A change of thickness or diameter outside the ranges specified in Table 2A in Appendix I of this standard.

(iii) An increase in the minimum specified preheats temperature of more than 50

OC.

(iv) Any decrease in the minimum specified preheats temperature.

(v) A change in the type of current, i.e. AC to DC, or a change in electrode polarity.

(vi) For non-impact tested procedures a change of consumable classification requires the qualification of a new welding procedure.

(vii) For impact-tested procedures a change of consumable classification or brand name requires the qualification of a new welding procedure.

(viii) Any change in wire/flux combination.

(ix) A change in shielding gas type or nominal composition.

(x) A change of weld preparation in shape or configuration including fit-up tolerances.

(xi) For the root and capping passes any change in the electrode size and for other passes any change of more than one increment size in the electrode size used in the qualified welding procedure.

(xii) Any change in the post weld heat treatment temperature or time.

(xiii) The introduction of any deposition augmentation system (e.g. iron power or hot wire additions).

(xiv) Any change in the rate of addition of any supplementary consumable.

(xv) In addition to the above, the following changes, when made, shall require re-qualification where weld metal and HAZ toughness is a requirement.

(xvi) A change from multi-pass to single pass or vice-versa.

(xvii) Any change in the electrode diameter or weave width beyond that used in the qualification test or a change in any other parameter likely to increase heat input or decrease toughness.

(xviii) Any decreases in the minimum specified preheat or an increase of more than 20°C in the inter-pass temperature from that qualified subject to the maximum inter-pass limitations.

(Addition)

(h) All welding procedure qualification test welds shall be subjected to radiographic and magnetic particle examination and where applicable ultrasonic examination prior to mechanical testing. (Addition)

(i) A macrograph of each hardness macro-section at a magnification of X2 such that the hardness indentations are clearly visible together with a sketch identifying the indentations shall be submitted with the welding procedure qualification test report to QP for approval.



All welding procedures shall be subject to a macro examination and hardness survey in accordance with Figure 2, in Appendix II of this standard, using a Vickers pyramidal indenter with a 10Kg load. Hardness test for fillet and repair welds shall be as in Figs. 3 and 4 of NACE MRO175/ ISO 15156 respectively. A dendritic type etchant shall be used to ensure clear definition of the fusion line. The maximum hardness allowable is 248 Hv10 for all QP process piping unless otherwise specified in the design. (Addition)

(j) Tubular butt joint test pieces shall be prepared to qualify all welding of pipework.

For impact tested procedures the test pieces shall be welded in the vertical (5G) and horizontal positions (2G) and will qualify all positions and for non impact tested procedures the test pieces shall be welded in the inclined 45° (6G) position and will qualify all positions. (Addition)

(k) Welders and welding operators shall not qualify on production welds but shall carry out performance tests. The welders shall be qualified for all passes, the use of partially qualified welders is not permitted.

Existing qualifications may be considered provided that they relate to a similar standard of work and use welding consumables having the same characteristics as those to be used in production. Fully correlated documentation demonstrating current qualifications endorsed by an acceptable CA, continuous experience with the qualified process and satisfactory past performance shall be submitted to QP for consideration. Acceptance of this documentation and existing qualifications shall be entirely at the discretion of QP.

All welder and welding operator tests shall be witnessed by QP or a CA approved by QP before the welder or welding operator is permitted to weld on any pipe-work. The decision taken by QP regarding the qualification of any welder or welding operator shall be final. (Addition)

(l) All welder performance tests for all positional welding shall be performed using the same materials, P-number, consumable and in the 6G position to qualify all positional welding in production. In the event that differing material groups are to be welded or when special welding procedures are to be adopted to meet unusual conditions, the welder shall be required to satisfactorily pass additional qualification tests as directed by QP. (Addition)

(m) All welders shall be qualified by visual, magnetic particle and radiographic examination. (Addition)

(n) All welding operators shall be qualified in the position to be used in production.

(Addition)

(o) The approval of a welder on a pipe of outside diameter ―O.D.‖ shall include approval for diameters ranges according to Table 2-b in Appendix I of this standard. (Addition)



(p) The use of qualification tests made on plate to qualify welders and/or welding operators for pipe-work is not permitted. (Addition)

328.2.2 Procedure Qualification by Others

Not Permitted (Amendment)

328.2.3 Performance Qualification by Others

Not Permitted (Amendment)

328.2.4 Qualification Record

In order to review and approve a welding procedure QP shall require the following documentation, as a minimum, to be included in the welding procedure qualification package:

(i) The PQR sheets

(ii) The production WPS

(iii) The WPS used for the qualification test

(iv) The procedure qualification data sheet, including dates & welders names, of the actual welding parameters applied to weld the test joint verified by the CONTRACTOR, QP and the CA

(v) The mechanical test results

(vi) The inspection and NDT results,

(vii) The parent material test certificates indicating the chemical analysis and mechanical properties,

(viii) The consumable batch certificates indicating the information specified in paragraph 328.3.1 of this specification,

(ix) The PWHT charts (where applicable).

(x) Calibration certificates for the used equipment such as; thermometer, volt and ampere meters etc..

(xi) Welders certificates

(xii) Gases purity and mixtures certificates if used.

Records of the test results for each procedure qualification shall be established and certified by QP. One of these shall be kept by the CONTRACTOR and shall be available to those authorised to examine it. Another shall be given to QP.

(Amendment)

328.3 WELDING MATERIALS

328.3.1 Filler Metals

All manufacturers of welding consumables shall be subject to approval by the QP. Table 3, in Appendix I of this standard, details the classifications of welding consumables acceptable to QP for specific materials.



The CONTRACTOR shall inform QP of the batch definition used by the manufacturer. Consumables shall be batch tested in accordance with AWS and shall be subject to approval by QP.

All as welded weld metal test results classified to AWS for consumables shall have the following mechanical and chemical properties as a minimum:

(i) Chemical composition of weld metal.

(ii) Tensile and Yield strength.

(iii) The percentage elongation.

(iv) Charpy impact data (where applicable).

Special consideration shall be given to the chemistry of the deposited weld metal such that, as a minimum, it matches the corrosion resistance of the parent material.

Welding consumables containing more than 1.00% Ni shall not be used for welding of any carbon and carbon manganese Ferritic steel pipe-work. The use of C-1/2Mo consumables is not permitted. (Amendment)

Handling of welding consumables shall be as per the approved WPS and Manufacture recommendation. (Addition)

328.3.2 Weld Backing Material

Not Permitted. (Amendment)

328.3.3 Consumable inserts

The use of consumable inserts is not permitted. (Amendment)

328.3.4 Shielding Gases

Different types of gas or gas mixtures may be used provided that the quality and type is appropriate to the welding process employed and in agreement with an approved welding procedure. Where gas mixtures are used, re-qualification shall be required for any change in gas mixture from that used for the welding procedure qualification.

The moisture content of any gas or gas mixture shall correspond to a dew point of -30°C or lower. A certificate of purity is required for all shielding gas used in welding procedure qualification.

In the field, only permitted gases as supplied by the manufacturer, in specially marked containers shall be used. Gas purity and quality for all containers shall be certified before use. Gases that are of questionable purity and those in containers that show signs of damage shall not be used. All containers shall be stored away from extremes of temperature.

Gas flow meter shall have a valid calibration certificate before use. (Addition)



328.4 PREPARATION FOR WELDING

328.4.1 Cleaning

The pipe and fitting surface shall be wire brushed till the white bare metal surface is exposed and the surface is free from paint, rust and all types of scale, covering a distance of 75mm up the bore and on the outer surface. This area shall also be degreased prior to welding using a suitable chloride-free and sulphide-free solvent. (Amendment)

328.4.2 End Preparation

(c) Cutting and Bevelling

The cutting of carbon steel pipes may be accomplished by either flame cutting, plasma cutting or mechanical methods.

If the material is a low or intermediate alloy steel, machine cutting is preferred However, if flame cutting is used the cut surface shall be dressed to remove approximately 2mm of material from the bevel by grinding. (Amendment)

328.4.3 Alignment

(a) Circumferential Welds

The maximum internal pipe diameter misalignment shall be 0.25t where 't' is less than 3mm and 1.6mm when 't' is larger than 3mm, where ‗t‘ is the pipe wall thickness. (Amendment)

(d) Spacing

The root gap shall be sufficient for dilution of the root by filler wire; the exact gap shall be determined during welding procedure qualification. (Amendment)

(e) Fabrication Tolerances

The CONTRACTOR is responsible for ensuring that fabricated piping conforms to code, specifications and contract requirements. The CONTRACTOR is also responsible for ensuring that fabricated dimensions agree with the dimensions on the piping drawings. Unless otherwise specified, dimensional tolerances shall conform to those shown in Figure 3 in Appendix II of this standard.

The CONTRACTOR shall not make any allowance for gasket thickness, except as dimensioned on the drawings.

Pipe runs shall not deviate from the horizontal or vertical by more than 3 mm in every 1000 mm, unless otherwise specified on the drawing. (Addition)

328.5 WELDING REQUIREMENTS

328.5.1 General

(a) Buttering for the purpose of alignment shall require the prior approval of QP.

(Amendment)

(b) appropriate records may not be filed in lieu of weld joint marking.

(Amendment)



(c) root tacking shall not be permitted. (Amendment)

(d) peening shall not be permitted on any pass. The use of needle guns is considered to constitute peening. (Amendment)

(e) At the end and before the full stop of the sentence add ―and sandstorm.‖ .

(Amendment)

(f) At the end and before the full stop of the sentence add ―and shall be subject to

witnessing by QP Inspector‖. (Amendment)

(g) All pipe 2" NPS and below shall be fully welded utilising the GTAW process. However, SMAW process may be used for the welding of utility piping as long as the heat input is compatible with pipe thickness and with prior QP approval. SMAW process should be used for the root pass in closing welds where it is impossible to purge the bore.

(Addition)

(h) For pipe sizes greater than 2" NPS and less than 6 "NPS the GTAW process is preferred for the root pass pipe and sizes greater than 6 "NPS may have the root deposited utilising the SMAW process. (Addition)

(i) The SAW process shall not be used for pipe sizes below 6" NPS unless

specifically approved by QP. (Addition)

(j) Butt welds made using a combination of welding processes will be permitted provided a welding procedure covering the combination is submitted to and approved by QP; in particular where the root run is made by the GTAW process, with SMAW fill and cap, the first pass with the SMAW process shall be made, as a minimum, with 2.5 mm diameter electrodes. (Addition)

(k) No pass shall be made with electrodes in excess of 4.0 mm diameter without the prior approval of QP. (Addition)

(l) The maximum permitted bead widths for SMAW and SAW welding shall be:

SMAW - 2.5 to 3 times the core diameter of the electrode.

SAW - 7 times the diameter of the filler wire.

(Addition)

(m) All GTAW process equipment shall be fitted with a high frequency starting unit. GTAW torches should also include a "gas lens" for improved gas shielding.

(Addition)

(n) All root runs shall be made without interruption other than the changing of electrodes/fillers or to allow the welder to re-position himself.

All welds should be completed without intermediate cooling and pipes shall not be moved or lifted until at least 50% of the final weld depth or 5 mm (whichever the greater) has been deposited. Where necessary, intermediate cooling under controlled conditions is permitted but only after the depth of weld required above has been achieved, the weld surface shall be examined by MPI before welding is permitted to re-start. Where the material involved is P No. 3 through‘ 6, heat treatment as specified in 331.2.4 shall be applied.



An interruption is defined as break in welding exceeding 20 minutes.

Unless specifically agreed by QP welding and preheat maintenance shall be a continuous operation.

When interruption of welding is agreed with QP, preheat may be removed provided that slow controlled cooling of the weld area by use of insulation blankets is ensured. In any event the joint shall be inspected visually and by MPI for linear defects prior to the recommencement of welding. Full preheating shall always be re-established before welding is restarted.

The intermittent welding may be allowed by QP for large diameters if it is necessary for proper welding sequence and as per the approved welding procedure.

(Addition)

(o) All attachments shall be located and fabricated in accordance with the CONTRACTOR'S drawings approved by QP and the requirements of this specification.

Permanent attachments, which are made to pressure pipe-work shall be welded and inspected in accordance with this specification. The NDT of the welds shall be in accordance with Section 9.0 of this specification.

Temporary attachments to pressure pipe-work shall not be made without approval of QP and shall be welded using qualified welding procedures and preheat as required in Clause 330 of this specification.

All temporary attachments shall be removed unless permission is obtained from QP to the contrary.

Temporary attachments shall be removed by thermal cutting and/or grinding. If thermal cutting is employed, the attachments shall be cut off at a minimum distance of 5 mm from the surface of the material and then ground flush.

Temporary attachments shall not be removed by breaking the back of securing fillet welds by hammering or any technique which may cause mechanical damage to the surface of the fabricated pipe-work.

Following the removal of a temporary attachment, any damaged area shall be ground to merge smoothly with the original surface and the surface shall be subjected to 100% MPI and a check made that the remaining wall thickness is not less than the design wall thickness.

Scars or undercut remaining after the removal of temporary attachments shall be repaired in accordance with QP approved procedure. This shall be ground flush with the surface of the base metal and subjected to MPI before the joint is offered for final inspection. Each case shall be recorded as a repair.

(p) Galvanized surfaces shall not be welded. (Addition)

(q) Vertical down welding is not permitted. (Addition)

(r) For the welding and heat treatment of Valves and Monolithic Insulation Joints, the manufacture recommendations and precautions shall be considered to avoid damaging the sealing materials. (Addition)

(s) For the tie-ins weld joints with the existing piping the following shall applicable:



Ultrasonic lamination check shall be carried at the tie-in location before any cut.

MPI shall be carried out on the bevel of the existing pipe.

Preheat shall be carried out as per table 4 in Appendix I of this standard for the existing material.

The root pass shall be checked by MPI.

Preheat shall be carried out as specified above before depositing the hot pass.

After weld completion the PWHT shall be carried out as per item 331 and Table 5 of this standard.

The completed welds shall be subjected to 100% RT and MPI.

(Addition)

328.5.2 Fillet and Socket Welds

Whenever practicable, fillet welded joints should have a minimum of three weld passes, two of which should be showing for visual inspection. Socket welding and threaded connections are not allowed for process service.

(Addition)

328.5.3 Seal Welds

Joints to be seal welded shall be made up clean and without the use of tape or any compound. A qualified welder shall perform welding in accordance with a qualified welding procedure. The welding shall not cause damage to the threaded fitting and the seal weld shall cover all exposed threads. (Amendment)

328.5.4 Welded Branch Connections

(i) For branch connections larger than NPS 2, wherever practical, a band centred on the location of the proposed branch shall be ultrasonically examined to confirm the quality of the parent pipe. (Addition)

328.5.5 Fabricated Laps

Not permitted. (Amendment)

328.5.6 Welding for Severe Cyclic Conditions

The weld reinforcement shall have an even finish and shall merge smoothly with the parent material without abrupt irregularity or undercutting in order to minimize stress raisers and generally be suitable for MPI. Surfaces of butt joints required to be flush shall be finished so as not to reduce the thickness of the thinner base metal or weld metal. (Addition)

328.5.7 Proximity of Welds

Unless noted otherwise on the drawings, all pipe to pipe joints shall be butt welds. The distance between the toes of adjacent butt welds shall be at-least equal to the pipe diameter or 100 mm whichever is higher. The distance between the toes of butt weld and adjacent attachment weld shall be at-least four (4) times the nominal wall thickness of the pipe but not less than 50 mm where these conditions are not



possible, the CONTRACTOR shall seek approval for the specific configuration from QP.

Longitudinal welds shall be located so as to clear openings and external attachment welds. Toe to toe distance between welds shall be a minimum of one pipe diameter or 50 mm whichever is the greater. Adjacent longitudinally seam welded pipes shall be located so that the seams are offset 90

O or 250 mm whichever is the minimum.

Attachment of non-pressure parts by welds which cross existing main welds or for which the minimum nominal distance between the toe of the attachment weld and the toe of the existing main welds or branch welds is less than the smaller of twice the thickness of the main pressure pipe or 40 mm should be avoided.

If unavoidable the area to be welded over shall be subject to 100% surface crack detection and 100% ultrasonic examination prior to welding. After welding, the welds and adjacent area shall be similarly examined. (Addition)

328.6 Weld Repairs

The repair rate shall be reported on a linear basis, submitted to QP on a weekly basis and shall not exceed 3% during production. If this level is exceeded, the CONTRACTOR shall investigate the reasons responsible for the increased repair rate and report his findings to QP with a proposed method of rectification.

𝐏𝐞𝐫𝐜𝐞𝐧𝐭𝐚𝐠𝐞 𝐑𝐞𝐩𝐚𝐢𝐫 𝐑𝐚𝐭𝐞 =𝐃𝐞𝐟𝐞𝐜𝐭𝐢𝐯𝐞 𝐋𝐞𝐧𝐠𝐭𝐡 𝐑𝐞𝐩𝐚𝐢𝐫

𝐓𝐨𝐭𝐚𝐥 𝐥𝐞𝐧𝐠𝐭𝐡 𝐨𝐟 𝐰𝐞𝐥𝐝𝐢𝐧𝐠 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐞𝐝

No rectification, repair or modification may be made without QP approval.

Extent of cracks in welds or base metal shall be ascertained by use of non-destructive inspection. The cause of cracking shall be identified prior to removal and repair and full report issued on cause and corrective action.

Repairs to welds shall be limited to 30% of the weld length for a partial wall repair or 20% of the weld length for a full wall repair. When these criteria are exceeded the weld shall be completely cut out and re-welded.

The removal of defective areas shall be done by machining, gouging, grinding and any other method, which produces a clean, uncontaminated surface for re-welding. The resulting excavation shall be ground to bright metal and have a contour to permit ease of repair welding. Defect removal shall be assured by MPI.

Arc air gouging shall only be performed on material thickness exceeding 9.5 mm. Prior to commencement a zone not less than 150 mm wide shall be preheated to the temperature range indicated on the WPS.

Removal and repair of cracks in weld deposits or base metal shall be witnessed and approved by QP and/or CA who re-serves the right to witness the repair.

Repair welding shall be performed in accordance with the approved qualified welding procedure and the following:

(i) The crack and 50 mm of sound metal beyond each end of the crack shall be removed by a method approved by QP.

(ii) The welding sequence and technique shall be selected to minimize distortion and restraint.



(iii) Preheating shall be to a temperature of 50OC above that specified in the

relevant original welding procedure.

QP may require further tests or simulated repairs.

Additional weld metal shall be deposited using an electrode preferably smaller than that used for making the original weld.

Subsequent to repair, the repair area plus 100 mm on either side shall be re-inspected 100% by all the NDT methods prescribed for the original weld. Weld repairs shall be limited to two (2) attempts in any production weld. QP also reserves the right to request complete re-welding of the joint.

The use of single pass weld repairs and the rectification of damage at temporary attachment locations by spot weld deposition shall not be permitted.

All repairs, including those performed prior to PWHT, shall be recorded. Weld repairs shall be indicated by the use of R1, R2 or RW to indicate first or second repair and re-weld respectively.

These indicators shall be recorded as a suffix to both the weld and inspection report numbers. Where welds are repaired or re-welded they shall retain their original weld number. Inspection reports for weld repairs or re-welds shall retain their original report number. All recording shall be completed on a progressive basis.

Rectification, repairs and modification shall be fully identified and documented. This shall include detailed inspection procedures, with an accurate description of the dimensions and locations of all defects and repairs for reference during final and/or in service inspection.

The CONTRACTOR shall maintain an up-to-date register of all welds found to contain unacceptable defects. Repairs performed both prior to and after PWHT shall be recorded and the register shall be freely available for inspection by QP at any reasonable time. The register shall include but not limited to the following information:

(i) Weld identification.

(ii) Weld type and thickness.

(iii) Welding procedure number.

(iv) Welding process or processes.

(v) Welder or welding operator.

(vi) Details of defect.

(vii) Date welded.

(viii) Date defect found.

(ix) Repair procedure.

(x) Date of repair and date repair accepted by CONTRACTOR/QP

(xi) HT records, NDT Methods / Techniques

(Addition)



330 PREHEATING

330.1 GENERAL

Preheating shall be carried out by electrical resistance or with gas burners specifically made and shaped for the operation. Hand held torches shall not be used for preheating purposes unless approved by QP.

NOTE : Electrical resistance pads are the preferred method of preheating.

(Addition)

330.1.3 Temperature Verification

Preheating methods shall ensure a satisfactory temperature distribution around and through the material of the joint to be welded. Excessive local heating of pipe surfaces shall be avoided. Preheat and inter-pass temperatures shall be measured by digital thermometer, thermocouples, thermo-crayons or a combination of these methods approved by QP. During welding, the inter-pass temperature shall be monitored and unless otherwise established by procedure qualification, shall not exceed 250

oc. The minimum inter-pass is to be the minimum pre-heat temperature.

(Addition)

330.1.4 Preheat Zone

When preheat is specified the applicable temperature shall be maintained for a minimum distance of 75 mm or 4t from the weld centre line, whichever is the greater. (t = material thickness). Lagging shall be provided on adjacent areas, if necessary, to maintain the required degree of preheat during welding. Recommended preheats for cutting and welding are given in Table 4 in Appendix I of this standard. (Amendment)

330.2 SPECIFIC REQUIREMENTS

330.2.4 Interrupted Welding

If welding is interrupted then the requirements of paragraph 328.5.1 (n) shall apply.

(Amendment)

331 HEAT TREATMENT

331.1 GENERAL

All Post Weld Heat Treatment shall be carried out in accordance with this clause.

The CONTRACTOR shall submit for approval by QP, PWHT procedures detailing, as a minimum, the following:

(i) Heat treatment method (furnace or local),

(ii) Heat treatment parameters,

(iii) Thermocouple location and attachment method,

(iv) Details of insulation etc.,

(v) The type, number and location of supports installed to prevent distortion etc.



PWHT should preferably be carried out in a stationary furnace, but where necessary, local PWHT of circumferential welds using electrical pad type elements is permitted subject to control of temperature gradients along the pipe length. The use of manually operated gas torches to carry out PWHT is not permitted.

Any furnace being used for heat treatment shall have a current furnace thermocouple calibration certificate. Thermocouples for both furnace and local heat treatment shall be connected to a suitably calibrated chart recorder, and the charts numbered with spool and weld numbers for scrutiny and endorsement by QP. These charts shall become the property of QP after heat treatment.

The CONTRACTOR shall inform QP prior to any PWHT operation in order to permit a full review and inspection to be made. All PWHT operations are subject to approval by QP.

If a repair is to be performed after PWHT then further PWHT is required after the repair is performed. A Welding Procedure Qualification Test will be required by QP to demonstrate the effect of multiple PWHT on the design strength and notch ductility of the material.

The CONTRACTOR shall ensure that adequate structural support is installed during any PWHT operation to prevent any sagging, warp age or distortion during the thermal cycle. (Addition)

331.1.3 Governing Thickness

(a) Figure 4, in Appendix II of this standard provides guidance on the heat treatment of branch connections.

(Amendment)

331.1.4 Heating and Cooling

(i) If a furnace post weld heat treatment is used, the furnace temperature shall not exceed 400

OC at the time of loading and unloading.

(ii) The maximum rate of heating from 400OC shall not exceed 220

OC per hour for

pipe wall thickness up to and including 25 mm and 5500/t OC OR 55

OC per

hour, whichever the greater, for pipe wall thickness greater than 25 mm.

(iii) The maximum rate of cooling from the holding temperature to 400OC shall not

exceed 275 OC per hour for pipe wall thickness up to and including 25 mm and

6875/t OC OR 55

OC per hour, whichever the greater, for pipe wall thickness

greater than 25 mm.

(iv) The CONTRACTOR shall consider the need for a slow heating rate for complex fabrications

(v) The presences of low melting point materials in liquid phase in intimate contact with the steel during heat treatment can generate detrimental effects such as inter granular penetration, embrittlement or cracking. Metals or alloys of lead, lead/tin solders, zinc, cadmium, aluminium and copper shall not come into contact with the steels during PWHT.

(vi) For welds involving existing pipe-work in sour service a higher preheat is required together with a post weld hydrogen release treatment and shall be as given in Table 4 and Table 5 in Appendix I of this standard. For quenched and



tempered materials, the PWHT soaking temperature shall be less than the tempering temperature by at least 25°C.

(Amendment)

331.1.6 Temperature Verification

For local PWHT, temperature measurement shall be made by thermocouples attached directly to the pipe and shielded from direct radiation particularly the electric pad type elements.

The thermocouples shall be welded to the pipes by the capacitance discharge method.

The number and location of thermocouples shall be as per table 8, appendix I of this standard.

For furnace heat treatment of several spools, thermocouples shall be attached to sufficient spools including pipes at the centre and bottom of the heat treatment charge to ensure uniform temperature distribution in the furnace. (Amendment)

331.2 SPECIFIC REQUIREMENTS

331.2.4 Delayed Heat Treatment

If a weld in material of P-No 3 through 5 is allowed to cool to ambient temperature prior to final post weld heat treatment, intermediate post weld heat- treating shall be required.

Upon completion of welding the joint shall be heat treated immediately by raising it‘s temperature to 300

OC and holding it there for one (1) hour per 25 mm of thickness,

with a minimum soak time of 30 minutes. Upon completion of the soak time the joint shall be slow cooled under insulation.

When the welds are between materials that have greater than 4% Cr and a wall thickness greater than 25 mm the weld shall be raised, immediately after welding, to a temperature within the PWHT range for that material and held there for 30 minutes after which it shall be slow cooled under insulation. (Amendment)

331.2.6 Local Heat Treatment

When heat treatment is applied locally, the weld shall be heated and insulated such that the material temperature shall exceed half the heat treatment temperature over

a band of at least 2.5rt each side of the weld centre line, see Figure 5 in appendix II of this standard, where ‗r‘ is the nominal bore radius and ‗t‘ is the nominal wall thickness. (Amendment)

332 BENDING AND FORMING

332.1 GENERAL

The CONTRACTOR shall submit to QP for approval a full specification of the proposed bending methods, which shall include at least the following:

i) material type and range of size and thickness.

ii) range of bend radii and fibre elongation.

iii) minimum and maximum metal temperature during bending.



iv) method of heating and maximum hold time.

v) bending apparatus and procedure to be used.

vi) material and procedures used to provide internal support during bending.

vii) required heat treatment (if applicable).

viii) post bending non destructive testing.

ix) post bending dimensional checks.

Bends shall not be wrinkled, cracked, gouged, die-marked or buckled and shall not be excessively scaled. Cut and shut, creased or corrugated bends are not permitted.

Bending shall be to a minimum radius of 5D (where D = nominal pipe Diameter) unless stated otherwise on the contract drawings. Circumferential welds are not permitted on pipe bends.

The pipe wall thickness after bending shall not be less than the design wall thickness, i.e. the nominal pipe wall thickness minus the mill tolerance of the pipe. QP shall approve the extent and method used for thickness checking. (Addition)

332.2 BENDING

332.2.3 Corrugated and Other Bends

Mitre bends shall not be used.

Pipe bends shall preferably be produced from seamless pipe, where this is not practical and seam welded pipe is used the bending shall be by induction bending to a procedure approved by QP. (Amendment)

332.4 REQUIRED HEAT TREATMENT

332.4.1 Hot Bending and Forming

QP may specify additional heat treatment requirements. (Addition)

332.4.2 Cold Bending and Forming

(a) All cold bends in P-1 and P-3 thru‘ P-6 materials shall be subjected to heat treatment if

The hardness after bending exceeds 248 Hv10 for non-refinery service and 200 Hv10 for refinery service.

The increase in hardness as a result of bending exceeds 100Hv.

The bend radius is less than 2D.

(Addition)

335 ASSEMBLY AND ERECTION

335.1 GENERAL

335.1.1 Alignment

(a) Piping Distortions. Removal of pipe distortion using either heating or mechanical devices is not allowed. (Addition)



335.2 FLANGED JOINTS

335.2.1 Preparation for Assembly

Internal weld surfaces of butt welds at orifice flanges and other flow measuring instruments shall be ground flush.

Machined surfaces of flanges shall be protected during any heat treatment process.

(Addition)

335.2.2 Bolting Torque

Flange bolting shall be tightened evenly and sequentially to impose equal pressure on the gaskets in accordance with QP Standard ES.5.06.0019 – Flange Bolting Guidelines. (Addition)

335.2.3 Bolt Length

The bolts shall be of a length that will extend entirely through but not more than 6.4mm beyond the nuts. All high strength bolts shall be pre-tensioned to the proper proof stress in accordance with the governing ASTM standard.

Ilex OT lubricant or equivalent shall be applied to all flange bolts before joints are assembled except that lubricant should not be applied to bolts when using bolt pre- tensioning equipment. (Addition)

9.0 SUPPLEMENTARY TO CHAPTER VI OF ASME B31.3, INSPECTION, EXAMINATION AND TESTING

The following clauses are supplementary to Chapter VI of ASME B31.3 – Edition 2008.

340 INSPECTION

340.1 GENERAL

QP shall have free access, at all times, to the fabrication and erection areas or any other part of the CONTRACTOR'S yard that concerns the work.

QP may wish to inspect materials, equipment, testing facilities and fabrication at any stage and to reject any part, which does not comply with this specification.

(Addition)

341 EXAMINATION

341.1 GENERAL

The CONTRACTOR shall formulate and implement a quality control plan complying with the requirements of this specification.

341.3 EXAMINATION REQUIREMENTS

341.3.1 General

(a) For all materials, final examination shall be performed after completion of any heat treatment. An initial (non acceptance) examination shall be performed



prior to PWHT to permit any necessary repairs/rectification and inspection at the earliest possible stage. (Amendment)

341.3.2 Acceptance Criteria

(a) The acceptance criteria for all welds shall be as per Table 6 in Appendix I of this standard. (Amendment)

341.4 EXTENT OF REQUIRED EXAMINATION

The extent of examination shall be as specified in Table 7 in Appendix I of this standard. (Amendment)

342 EXAMINATION PERSONNEL

342.1 PERSONNEL QUALIFICATIONS AND CERTIFICATION

Only personnel qualified in accordance with the requirements of ES-S-60 shall be allowed to undertake the required examinations. (Amendment)

343 EXAMINATION PROCEDURES

All examination shall be performed to written procedures in accordance with ES-S-60 and the applicable requirements of this specification and approved by QP, prior to the commencement of fabrication.

Examination procedures shall take account of actual weld preparations and joint access to ensure full inspection coverage of the joint cross section. Limitations on the use of an examination procedure which, are due to joint design or fabrication sequence, shall be defined in the procedures.

Any limitations subsequently identified at the fabrication stage shall be subject to the approval of QP prior to welding the joint.

The CONTRACTOR shall furnish a dark room and viewing equipment available at any time for QP or the CA to review radiographs.

On welds, which are not subject to PWHT, NDT for acceptance purposes shall be performed no sooner than 48 hours after completion of welding. QP may relax this requirement to 24 hours providing the CONTRACTOR can demonstrate suitable welding controls. (Addition)

344 TYPES OF EXAMINATION

344.2 VISUAL EXAMINATION

It shall be the CONTRACTORS responsibility to present the pipe-work in a suitable condition for QP‘S and the CA'S inspection, which includes the provision of ladders and scaffolding when required.

Final inspection shall be carried out after the removal of all slag, mill scale, dirt, paint, oil or any other foreign matter from the pipe-work.

The bore sides of all joints, which are accessible for the purpose shall be examined throughout their circumference, with full use being made of suitable optical instruments such as fibro-scope, intro-scope or mirror. (Amendment)



344.3 MAGNETIC PARTICLE EXAMINATION

Magnetic Particle Examination shall comply with the requirements of QP Specification ES-S-60. (Amendment)

344.3.1 Method

Arc strikes outside of the weld preparations shall not be acceptable. Where these are determined during inspection, the arc strike shall be ground out to a smooth profile and subjected to MPI. Where the arc strikes are caused by damaged cables the areas shall be additionally etched to ensure freedom from contamination.

(Amendment)

344.5 RADIOGRAPHIC EXAMINATION

Radiographic Examination shall comply with the requirements of QP Specification ES-S-60 (Amendment)

All radiation works shall be carried out according to Qatar State low #31 and QP Radiation Safety Standard for Industrial Radiography QP-STD-S-056. (Addition)

344.5.1 Method

X-ray techniques shall be used for all shop radiography of pipe-work up-to 25 mm wall thickness. However, where the use of X-rays is impractical due to space limitation or unavailability of power source, then gamma ray isotopes may be used subject to the advance approval of QP.

In each case the technique shall be qualified using a source side image quality indicator of the wire type to BSI BS EN 462-1.

The single wall, single image technique should be used whenever possible. Lead intensifying screens and fine grain high contrast film shall be used. Film density shall be 2.0 - 3.0 through the thickest portion of the weld and the radiographic sensitivity shall be 2% or better.

When the double wall exposure technique is unavoidable, a minimum of two exposures for pipe sizes up to NPS 2" and a minimum of three exposures for pipe sizes between NPS 3" and NPS 8" shall be made. Above NPS 8" sufficient exposures shall be taken to ensure that the weld seam is fully radiographed and that adequate overlap of film takes place.

Radiography of production welds shall use wire type IQI‘S with each film exposure and this shall be placed on the source side where accessible.

(Amendment)

344.5.2 Extent of Radiography

(c) Spot radiography is not permitted. (Amendment)

(d) Where branch connections have wall thickness exceeding 16 mm, radiography shall be carried out (with film on the bore side) when the weld depth is similar to the wall thickness, i.e. before the reinforcing fillet weld is applied. (Addition)

344.6 Ultrasonic Examination

Ultrasonic Examination shall comply with the requirements of QP Specification ES-S-60. (Amendment)



344.6.1 Method

The use of ultrasonic examination instead of radiographic examination may be desirable under certain conditions of joint geometry or thickness. However its use requires the specific approval of QP for each joint configuration and thickness and is normally restricted to wall thickness greater than 10 mm.

QP may specify ultrasonic examination to supplement radiography where radiographic interpretation is difficult.

The CONTRACTOR shall employ any additional NDT techniques necessary to ensure full evaluation of welds or clarification of defect indications.

Ultrasonic examination procedures shall be qualified for:-

i) Set-in and set-on branch welds.

ii) Circumferential butt welds above 10 mm thick.

iii) Transitional welds of unequal thickness.

(Amendment)

344.8 HARDNESS TESTING

Hardness checks shall be carried out on all production welds in sour service piping and heat treated welds to the following extent:

1) Hardness check per 10 m of weld or per 10 circumferential welds, whichever, yields the greater number of tests (MINIMUM ONE TEST).

2) The cap of the weld at test location shall be removed and the surface ground smooth. Three measurements shall be taken on the weld and HAZ and the average of the three shall be taken as the result. (Addition)

344.9 ADDITIONAL EXAMINATION

If QP or the CA has reason to believe that a defect exists in any weld or pass, including tack welds, then the CONTRACTOR when so directed, shall perform all inspection and testing required by QP.

If percentage checking of welds reveals a defective weld, a further two (2) welds completed by the welder in question shall be selected for inspection. If these prove to be defective, the percentage shall be increased at QP‘S discretion. These additional welds shall not be deemed part of the percentage inspection.

If the weld is deemed defective, it shall be repaired or replaced to the satisfaction of QP.

Where QP deems it is necessary to increase the extent of testing other than for reasons of defects, the CONTRACTOR shall comply with such increased requirements and perform this work. (Addition)

345 TESTING

Contractor shall submit detailed testing procedure (including flushing and drying) for QP prior approval for all new lines. However, Contractor shall include in their Test Package the testing of existing lines also, wherever field welds are completed between the old and new lines.



Where a new line is tied-in to an existing line, the existing line integrity shall be assessed in accordance with API 570, Piping Inspection Code, and the remaining available thickness at the tie-in point shall be checked by Ultrasonic. However, contractor shall submit a detailed Tie-In procedure for QP prior approval.

In addition to testing of valves at factory, the valves shall be tested at site before installation. The extent of testing shall be based on the criticality requirements approved by QP. (Addition)

Contractor shall submit a Test Package for the lines to be tested. This Test Package shall include and not limited to the following information:

a) Testing limits

b) Testing pressure

c) Testing media, applicable inhibitors, chlorine content.

d) Material traceability to the mill certificates.

e) Applied welding procedures, welders, date of welding NDT, repair...etc.

f) Release note, endorsed by QP/TPI for testing.

The CONTRACTOR shall provide QP with at least 24 hours notice of testing.

(Addition)

345.2 GENERAL REQUIREMENTS FOR LEAK TESTS

345.2 .7 Test Records

All tests shall be witnessed by QP and recorded on test record sheets, which shall be signed by both the CONTRACTOR and QP. (Addition)

345.3 PREPARATION FOR LEAK TESTS

For field welds completed between "old" and "new" material the whole line shall be hydro-tested at 1.1 the maximum operating pressure or design pressure or top of piping class rating pressure, whichever is higher.

Differently rated systems shall be tested independently.

In situations where it is impractical to hydro-test, the reasons why shall be documented and recorded. It shall be QP‘S decision to waive hydro-test.

Prior to testing all equipment and piping shall be thoroughly cleaned of all dirt and construction debris or other foreign matter using potable water.

All lines shall be flushed with water prior to testing.

Testing of the piping lines with valves in closed conditions is not permitted. (Addition)

345.4 HYDROSTATIC LEAK TESTS

345.4.1 Test Fluid

The test medium shall be potable water unless stated otherwise on the contract drawings or by QP. However, The PH of the potable water shall be in the range from



6.5 to 7.5 and the chloride content shall be 100 ppm maximum. After testing, the tested piping system shall be dried as required by the service fluid.

(Amendment)

345.4.2 Test Pressure

(d) The test pressure shall be 1.5 times the design pressure or top of class rating pressure, whichever is higher. When the design temperature is greater than the test temperature, then the test pressure shall be calculated as per equation no 24 of ASME B 31.3. Pressurising of the system shall be carried out in increments of 25% total pressure value or as designated by QP at the time of testing up to the test pressure. There will be a hold for 15 minutes at each increment. This is to ensure that the system is stabilised and to avoid over pressurizing. The pressure shall be maintained at each incremental stage for a minimum of two minutes or as specified by QP. Once the test pressure has been attained it shall be maintained for a period of approximately one hour before the detailed inspection takes place.

(e) Depressurising of the system shall be carried out at a maximum rate 200 psig/minute to avoid vacuum collapse of any part of the system while draining the water after the test. However, depressurising shall be carried out in steps at 25% of total pressure value and there will be a hold for 15 minutes at each step.

(f) Check valves shall be opened to ensure that water is completely drained.

(g) A record charts shall be made of the pressures and temperatures during pressurizing/depressurising as well as during actual testing.

(Addition)

345.5 Pneumatic testing is not permitted without the specific approval by QP. (Amendment)

345.10 Reinstatement Leak Test

After successful completion of the hydrostatic leak tests, piping Systems/subsystems shall be subjected to leak test to check the reinstatement work.

The test medium shall be water or nitrogen. The water quality shall be as specified in 345.4.1.

The test pressure shall be 90% of the design pressure or 1.1 of the maximum Operating pressure when the system/subsystem includes old existing piping.

The test duration shall be one hour.

Contractor shall submit a detailed procedure for the reinstatement leak test for QP review and approval. (Addition)

10.0 QUALITY REQUIREMENTS

10.1 The CONTRACTOR shall have a current and implemented QA system and QC procedures for shop and field piping fabrication, erection, etc., in compliance with the requirements of QP-STD-Q-004 and ISO 9000 for all works undertaken and shall meet QP‘s specified requirements.



10.2 The CONTRACTOR shall, within two weeks of receipt of the order, submit for approval a detailed quality Plan for fabrication, welding, installation and testing which complies with the applicable clauses and elements of ISO 9000 standards and project specifications.

10.3 It shall define the structure, welding, fabrication, installation and testing responsibilities, authority levels and internal and/or external interface arrangements of personnel.

10.4 It shall identify the items and services to which this specification applies, the level of control and verification.

10.5 It shall provide documents such as plans, procedures and instructions for the accomplishment of welding, fabricating, installation and testing activities to provide the required quality, taking into account the need for special controls, tests, tools, skills, etc..

10.6 The CONTRACTOR shall be responsible for ensuring that the final documentation and records provide the necessary objective evidence that the quality required has been achieved. This shall include the results of inspections, tests, monitoring of work performance, material and weld identification and related data such as qualifications of personnel and procedures.

10.7 The CONTRACTOR shall provide all necessary certification and documents in accordance with this Specification‘s requirements or any alternative specification identified by QP.

10.8 The CONTRACTOR shall appoint only qualified and experienced personnel with the necessary level of authority to ensure compliance with the requirements of this specification.

11.0 DOCUMENTATION

11.1 GENERAL

11.1.1 All communication, both documentary and spoken shall be in the English Language and all dimensions and weights shall be in SI (System International d' Unites) units.

11.1.2 The documents to be prepared by the CONTRACTOR to facilitate the fabrication and installation of the piping shall provide full and complete information and instructions including detailed methods and procedures. Approval or review of drawings by QP or QP Representative shall not relieve the CONTRACTOR of his responsibility to complete the work in accordance with the Contract Specification.

11.2 DOCUMENT SUBMISSION

The CONTRACTOR shall, as a minimum, submit the following documentation to QP for approval at least two weeks prior to the commencement of work:

a) Fabrication, welding and installation procedures.

b) Detailed fabrication drawings including identification of material grades, weld details and NDT requirements.

c) List of proposed welding consumables.

d) A Register of proposed welding procedures and their areas of application.



e) PQR'S and qualified WPS'S including those for weld repair, in accordance with this specification for both permanent work and temporary attachments.

f) Certificates of welders and welding operators qualified in accordance with this specification. Documents detailing qualifications and experience of engineers and all QA and QC personnel.

g) Procedures for the receipt, storage, handling and issue of welding consumables.

h) Material identification (including welding consumables) and control procedures.

i) Certificates for all CONTRACTORS supplied material (including welding consumables).

j) Procedures for Inspection, NDT, Examination and Testing, Format of the reports and personnel qualifications.

k) Post Weld Heat Treatment procedures and instructions sheets.

l) Forming/Bending Procedures.

m) Hydrostatic Test Procedure.



12.0 APPENDIX

12.1 APPENDIX I - TABLES

12.1.1 TABLE 1 - Welding Procedure Qualification Test Requirements

Test Method Thickness Range

t 25 mm t > 25 mm

NDT Method MPI/RT MPI/RT

Transverse Tensile 2 2

Bend Tests (Note 1) 4 SIDE 4 SIDE

Macro & Hardness 2 2

Charpy V-Notch WM Cap NONE 1

Impact Tests WM Root 1 1

(Note 2) HAZ Cap NONE 3

HAZ Root 3 3

NOTE :

1) Face & Root Bends to be substituted for side bends when t 10 mm.

2) Sets of HAZ Charpy specimens to be taken at FL, FL + 2 and FL + 5.

12.1.2 TABLE 2 A - Welding Procedure Diameter Qualification Ranges

Nominal Pipe Size

Qualification Test

Outside Diameter

Range Qualified

Thickness Range

Qualified

Less than NPS 6 0.5 OD to OD As per ASME IX

Greater than or equal to NPS 6 NPS 3 and above. As per ASME IX

12.1.3 Table 2-B Approval Diameter range for welders Qualification tests

OUTSIDE DIAMETER TESTED RANGE APPROVED

OD 33.4 mm (NPS 1) OD TO 33.4 mm (NPS 1)

33.4 mm(NPS 1) OD 73 mm (NPS 2½) 0.5 OD TO 2 OD

OD 168.3 mm (NPS 6) OD 88.9 mm (NPS 3)



12.1.4 Table 3 - Recommended Filler Metals for P-Numbers 1 thru’ 5

These recommendations are based on matching the impact toughness, the tensile properties and the chemistry of the weld deposit with the parent material. It is by no means exhaustive given the variety of possible applications and so other electrodes may also be acceptable and shall be proven in the PQR testing before any application.

STEEL P-Number SMAW GMAW

GTAW

FCAW SAW

C & C-Mn (-29OC) P-1 E70 XX ER70 S-3 F7 XX-EM12K

(-46OC) E70 XX-1 ER 70 S-3

1/2Cr-1/2Mo P-3 E80 XX-B1 ER 80 X-B2L E81 T1-B1 F8 XX-EXXX-F4

1Cr-1/2Mo P-4 E80 XX-B2 ER 80 X-B2 E8 XTX-B2 F8 XX-EXXX-B2

1-1/4Cr-1/2Mo or B2L or B2L or B2X or B2H

2-1/4Cr-1Mo P-5A E90 XX-B3 ER 90X-B3 E9XTX-B3 F9 XX-EXXX-B3

or B3L or B3L or B3X or B4

3Cr-1Mo P-5A E90 XX-B3 ER 90X-B3 E9XTX-B3 F9 XX-EXXX-B3

E502-XX ER 502 E502T-1 or 2

5Cr-1Mo P-5B E502-XX ER 502 E502T-1 or 2 F9 XX-EXXX-B3

or B6H

9Cr-1Mo P-5B ER 505 E505T-1 or 2



12.1.5 Table 4 - Minimum Recommended Preheat Levels

THERMAL CUTTING

Material Material Thickness Preheat (OC)

C-Steel All 15

C-Mo

½ to 1¼ Cr-Mo

12.5 mm

12.5 mm

20

120

2 to 3 Cr-Mo All 150

5 to 9 Cr-Mo All 200

WELDING (New Material)

Material P-Number Material Thickness (mm) Preheat (OC)

C-Steel P-1 25

25

15

100

C-Mo P-3 12.5

12.5

20

100

½ to 1¼ Cr-Mo P-4 12.5

12.5

100

150

2 to 3 Cr-Mo P-5A 12.5

12.5

150

200

5 to 9 Cr-Mo P-5B 200

WELDING (Existing Material)

Material P-Number Material Thickness (mm) Preheat (OC)

C-Steel P-1 19

19

100

150

C-Mo P-3 12.5

12.5

100

150

½ to 1¼ Cr-Mo P-4 12.5

12.5

100

150

2 to 3 Cr-Mo P-5A 12.5

12.5

150

200

5 to 9 Cr-Mo P-5B 200



12.1.6 Table 5 – Post weld Heat Treatment (PWHT) and Baking

Material P-Number Material Thickness

(mm)

Soak Temperature

(OC)

Soak Time

C-Steel P-1 19 (1)

19

200+10

620+10

2 hours

2.5 mins per mm (min. of 30 minutes

C-Mo P-3 12.5 (1)

12.5

200+10

650+10

2 hours


½ to 1¼ Cr-Mo P-4 12.5 (1)

12.5

200+10

650+10

2 hours

2. 5mins per mm (min. of 60 minutes

2 to 3 Cr-Mo P-5A 12.5 (1)

12.5

200+10

700+10

2 hours


5 to 9 Cr-Mo P-5B All thicknesses 700+10 2.5 mins per mm (min. of 60 minutes

NOTES:

(1) Applies to the existing material in service.



12.1.7 Table 6 - NDT Acceptance Criteria

Type of Defect Limitations for all Service Conditions

Circumferential, Longitudinal and Branch Connections

Cracks Not Permitted.

Lack of Fusion Not Permitted.

Incomplete Penetration. Not Permitted.

Internal Porosity Isolated Pores

The maximum size of isolated pores shall be 1/4 t or 4.0 mm, whichever the lesser. If the separation of two isolated pores is greater than 25.4 mm then maximum size is 1/3 t or 6.4 mm.

For t > 50.8 mm, maximum isolated pore size is 9.5 mm.

Aligned Rounded Indications

Summation of the diameters < t in any 12 t (As per ASME VIII Division 1 Appendix 4)

Slag Inclusions, Tungsten Inclusions or Elongated Indications.

Individual Length t/3.

Individual Width 2.4 mm or t/3.

Cumulative Length t in any 12 t of weld length.

Undercutting Not Permitted.

Surface Porosity or exposed

Slag Inclusion (for t 5 mm).

Not Permitted.

Surface Finish The weld shall exhibit a smooth contour and blend with the parent material without causing stress raisers.

Concave Root Surface Not Permitted.

Reinforcement

(for Fillet Welds height is measured from the throat)

The maximum reinforcement shall be as follows:-

NPS 4 and below = 1.6 mm for all thicknesses.

Greater than NPS 4 = 3.0 mm for all thicknesses.

Internal Protrusion The maximum root penetration shall not be greater than 1.6 mm for NPS 2 and smaller or 3 mm for larger pipes.

Misalignment To be within the limits of clause 328.4.3 of this specification.



12.1.8 Table 7 - Extent of Non Destructive Testing The minimum level of NDT is given below. This minimum level may by increased (at any level up-to 100%) if the welds are questionable or the NDT indicates excessive defects.

Group Service of Line Type of NDT & Percent

MPI RT

A Flare Systems (LP, MP & HP) Fuel Gas Heli-fuel Kill Fluid Propane Sour Hydrocarbon Liquid /Oil or Condensate Sour Gas Sour crude oil + water + gas mixture (Well Fluid from Wells) Formation Water or Produced Water (with or without dissolved H2S and different material is used) Sour Oil with high pressure e.g. downstream of the main oil line pumps or export pumps Inert gas Wet Diesel Fuel Sour Slop Oil

100

100 (2)

B Closed Drains for sour gas/liquid Fire Water/Fighting Glycol, Tri Ethylene Glycol B.A. Cascade (H.P. Side). Open drain lines for sour gas and sour liquid Sour Atmospheric Vent Gas Corrosion Inhibitor Instrument Air/Breathing Air (Offshore) Diesel fuel

20 100 (2)

C Atmospheric Vents Drinking Water (Offshore) Methanol Injection B.A. Cascade (L.P. Side) Chilled Water Closed drains of non-sour gas/liquid

20 20 (1)

D Halon System Hot Oil Open Drains of non-sour gas/liquid Sanitary Effluent Slop Oil Utility Water Utility Nitrogen (Onshore)

5

5 (1)

Notes:

(1) 20% examination means 20 welds in 100 welds, which are examined 100%, similarly for 5% examination. The given 5% and 20% examination shall be increased up to 100% if parts of the tested welds are defective.

(2) QP may specify ultrasonic examination for thickness greater than 19mm.



12.1.9 Table 8 -The number and location of thermocouples shall be as follows:

Pipe Size No of Thermocouples Location of Thermocouples

NPS 6 2 6 and 12 o‘clock

NPS 6 3 4, 8 and 12 o‘clock



12.2 APPENDIX II – FIGURES

12.2.1 Figure 1 - Removal of Charpy V-Notch Specimens

2 mm

Root Charpies for t > 25 mm ONLY (to include W.M., F.L., F.L.+ 2 mm

and F.L.+ 5 mm)

WELD METAL

FUSION LINE

FUSION LINE + 2 mm

FUSION LINE + 5 mm

FL +2 mm

FL +5 mm

FL t/2



12.2.2 Figure 2 - Location of Hardness Indentations

1) After the first Fusion Line indent, further indents shall be spaced at 1 mm intervals.

2) Indents shall be spaced at 1 mm

intervals in the Weld Metal. 3) Only three (3) indents required in

Parent Metal. 4) Spacing given in Detail 'A' also

apply to the Weld Cap.

x x x x x x x x x x x x x x x x x x x x

x x x x x x x x x x x x x x

1 mm

WELD METAL BM HAZ

X X X X X X X X X X X X X X

1 mm 1 mm

1 mm

d d

Detail ‘A’



12.2.3 Figure 3 - Dimensional Tolerances

4

1) + 3 mm maximum from the indicated dimensions for face to face, centre to face, location of attachments, etc..

2) + 3 mm maximum lateral translation of

branches or connections. 3) + 1.5 mm maximum rotation of flanges

from the indicated position. Measured as shown.

4) + 1 mm out of alignment of flanges from

the indicated position measured across any diameter.

Tolerances on dimensions which do not include pipe segments are to be based on ANSI specifications for fittings and/or flanges

1 4

Shall conform with fit-up tolerances

qualified in Welding Procedure.

1

1

2

3



12.2.4 Figure 4 - Post Weld Heat Treatment Requirements for Set-On and Set-In Nozzles

Set-On Nozzle Set-In Nozzle

PWHT if Tb + tc > 38mm PWHT if Th + tc > 38mm

Set-On Nozzle + Reinforcement Set-In Nozzle + Reinforcement

X = the greater of Tb + tc or Tr + tc PWHT if X > 38mm

PWHT if Th + Tr + tc > 38mm

Tb = nominal thickness of branch. Th = nominal thickness of header. Tr = nominal thickness of reinforcing pad or saddle. tc = 0.7Tb or 6.4mm whichever the lesser

tc

tc Th

Tb

Th

Tb

tc

Th

Tr

Tb

0.5Tr

Th

Tr

Tb 0.5Tr

Tc

QP STANDARD FOR THE FABRICATION, INSPECTION AND INSTALLATION OF CARBON, CARBON-MANGANESE AND LOW ALLOY FERRITIC PROCESS PIPEWORK (ADDENDUM TO ASME B31.3) Doc. NO. QP-STD-R-002 Rev. 1


12.2.5 Figure 5 - Local Heat Treatment for Branch Connections

r1 = Nominal Bore Radius of Main Pipe. r2 = Nominal Bore Radius of Branch Pipe. t1 = Thickness of Main Pipe. t2 = Thickness of Branch Pipe.

2.5 r2t1

2.5 r2t2

SHADED AREAS TO BE HEAT TREATED

QP STANDARD FOR THE FABRICATION, INSPECTION AND INSTALLATION OF CARBON, CARBON-MANGANESE AND LOW ALLOY FERRITIC PROCESS PIPEWORK (ADDENDUM TO ASME B31.3) Doc. NO. QP-STD-R-002 Rev. 1


REVISION HISTORY LOG

Revision Number: 1 Date: 21/07/2010

Item Revised: Whole Document

Reason for change/Amendment:

Changes/Amendments Made: This standard has been revised to incorporate latest developments in ASME B31.3 – Chapter V & VI (2008 Edition) and other standards referenced in the document, the latest market research and QP specific requirements. It has been also revised to satisfy the requirements of the standardization documents (QP-PRC-A-001 & QP-PRC-A-003).

Note: The revision history log shall be updated with each revision of the document. It shall contain a written audit trail of the reason why the changes/amendments have occurred, what the changes/amendments were, and the date at which the changes/amendments were made.

QP STD R 002 REV 1

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